Brake mechanism.



No. 832.113. PATENTBB 00T. 2, 1906. E. A. WORTHINGTON.

BRAKE MEGHANISM. APPLIUATION FILED sBPT.19,1905.

movement of the oar.

and gear elements.

l EDV/TARD A. VGRTHNGTON, 0F KRKWO'D, MXSSOURI.

no. ssenie.

Specicaton of Letters tatent.,

Application filed September 19, 1905, Serial No. 279,145,

Patented lot.

.To all?, whom, zit' may con/cern:

Bejitjmown that l, EDWARD A. Woa'rnf tiraron?, a citizen of the United States ci America, residing at Kirkwood, in the county of St. Louis and State of Missouri, have invented nevv and useful Improvements in Brake Mechanisms, or" which the 'following is a soeciiication.

bis invention relates to certain new and useful improvements in brake mechanisms, and has for its object to provide an auto-- matic brake for elevator-cars, dumb-Walters,- the oars of inclined railways, and the like .which 'will be set into action when the hoisting mechanism breaks to stop the car.

The preferred embodiment of the invention is illustrated in the accompanying,r draw ings, in Which- Figure 1 is a view in front elevation shoW- ing the application of the device as a brake for elevator-cars, and Fig. 2 is a view looking toward the'face of the rack and showing the driving-gears actuated by one oi the toothed members thereof.

Referring now more particularly to the acu companying drawings, the numeral 1 designates a portion. of an elevator-car, and 2 a stationary brake and gear element adapted to be fixed to the Walls of the elevator-shaft and to extend from too to bottom thereof` This member 2 is provided With brake-teeth 3 and gear-teeth 4, forming stationary brake It is preferred in practice to form both these sets oi teeth on a single rech-plate, although separate rack members may be employed.

m; Secured to the side of the car is a supporting-bracket 5, provided at its upper and lower ends with bearings and?, in which is journaled a vertical shaft or axle 8, carrying a revolnble brake member 9, consisting of a sleeve provided With spiral teeth 10 to coop.- erate with the brake-teeth S, The element 9 constitutes, in fact, a Worm which is adapted to revolve with the shaft S when the car is in motion, so that its spiral teeth or ilange 10 will Work between the brake-'teeth 3 and avoid resistance to the free up-and-dovm The worm or revoluble gear element 9 is splined to the shaft or axle 8, so as to turn therewithand' have a limited longitudinal motion thereon, ,such

'longitudinal motion being limited by-sti coiled cnshioningsprings 11, interposed between the Worm and the bearings 6 and 7.

The shaft 8 extends above the bearing 6 in,

the top of the car and carries at its upper end a beveled pinion 12, meshing 'with a beveled power-transmitting gear 13, ihredly mounted on shaft la, journaled in thearm of a biiurcated. bracket 15. v is a driving spur-gear 16, which meshes with the'raclr 4 and receives continuous motion therefrom as the car moves up and dovv'n in the shalt to impart motion in one direction or the other to the shaft 8 and the revoluble member 9. 1t 'will be understood that the rotation of the revoluble member 9 holds it inactive as the car is in motionior thereason that its teeth 1G travel between the teeth of the rack 3. y

The bracket 15 is connected with a roclru shaft 17, journaled in a supporting-frame 18,. carried by a base 1-9, secured to the top of the car and to the upper end of the bracket 5, and to said shaft is also connected arocli'ng Also hired to the shalt' le' arm or lever 19, which projects at an inward and downward angle therefrom and is slotted at its lower end for operative engagement With a connecting-pin 2G, by which it is attached to the inner end of a brake-shaft 21, slidably mounted in the frame 18 and carn rying at its outer end a brakeshoe 22 to engage a brake member or drum 23, fixed to the shaft 8., It Will thus be seen that uponswinrin'g the 'rocking arm vor lever 19 outward y the shaft 17 will be rocked in an up- Ward and inward direction, and Will transfer corresponding movement to the bracket 15, Wherebv the bevel -gear 13 will be moved ont of mcs ling engagement with the pinion 12, thus disconnecting the drivegearing and simultaneously throwing the brake-shoe` 22 in engagement with the brake member 23 to arrest the movement oi the shatS. This operation arrests the action of the rot-ary gear element 9, so that the teeth 1() thereof will engage the raclr-teeth and form va positive brake or lock to hold the car against downward movement. When the teethfl() come into engagement With the rack-tfeeth 3, shock or j'ar oi the car by being brought to a lOO.

quick stop is prevented or reduced to'. the,-

mmimum by the spline-and-g1oove connec-- tion between the shaft 8 andv member 9,

which will permit said member 9 ,toplay or oscillate on said shaft, such motion .being limited and cushioned by the s rings 11.'

The arm or lever 19 is adb ted .to 'be thrown into action by a contracti e springZll, connecting the same Wit y which pring thus serves to automatically ren the frame 18,

iro

lease the driving-gear 16 from engagement with the rack 4 and to throw the brake-shoe 22 into engagement With the brake member In order to hold said gear 16 in engagev ment with the rack 4 and the shoe 22 out of engagement with the brake member 23, locking' means are provided comprising a spring-catch 25, ada )ted to engage' a notch 26, formed in the rake-shaft 2l, which catch is adapted to be retracted bv a triplever 27. W hen .the inner vend of this lever is depressed, the catch 25 will be depressed therewith andy thrown out-*fof engagement with thenotch 26 against the resistance oi' its spring 25', and the spring 24 will 1thereupon act to rock the arm or lever i9, and thereby release the gear 1.6 and project the shoe 22 to arrest the motion oi the shaft S and revolubvle brake member 2, so as to stop .the motion of the car. The tri i member27 may be operated by any suitab e part ci the hoisting mechanism, but is here shown as adapte ,to be operated by the governor 28 of such mechanism. To the sliding sleeve 28 of this governor' the outer end of the lever 27 is connected', said lever being pivoted "co4` The lever tween its ends to a bracket 29'. will therefore be thrown into action to open ate the trip member when the governor-arms are forced outby centrifugal action upon the car moving at a faster rate than its normal rate of speed. Thus, if the hoisting mechanism should break and the ycar begins to descend, as soon as the speed of descent asses beyond the normal rate of travel of t 1e car the sleeve 28will move upward and elevate the outer end and depress the lower end oi the triplever 2,7, whereupon the gears i2 and 13 will be thrown out of action and the brak li shoe 2 2 thrown in to engagement with vthev brake member 23 to vbring the revolublcl brake element Qinto o eration to stop the car. The governor is riven by a belt 28a,

eig

passing around pulleys 28b and 28', fixed to the governor-shaft and shaft 14. In order to permit the rocker-arm 19 and the brakesheft 21 to be retracted, an adjusting-lever 3D is provided. This lever 30 is directly attached to the brake-shaft 2l and irojects ,downwardly through a slot 30 in the hase 19 and top of the car 1. B. means of this lever the brake-rod 21 may e drawn back- Ward to retract the brake-shoe 2,2 and reset the parts after sto pa e `of the car. By means of this lever the ra re mechanism may also be tripped by hand independently of the gov'- ernor mechanism.

The construction and mode of use of my improved saety-brake mechanism Will be readily understood from the foregoing description,

taken in connection with theA accompanyingdrawin s. It will. be seen that it provides a bralre evice which is sim le in construction, ,positive in action, and a apted to bring the car to a complete stopupon the braking of seems the hoisting mechanism without' undue jolts or jars and Without liability of' the parts of the brel-:e apparatus being' rendered 1nopera stationary rack-bar, a shaft carried byand movable with thecar, means `tor transmitting motion to 1said shaft during the movement of the car, a worm-Wheel carried by the shaft and' adapted to rotate therewith so that its threads will Work between and out of y.engagement with the teeth of the rackb,a,'1neans iol ar- 7 5' l. ln a brake for cars, the combination .0f al Y resting the movement of the-.shaft .and Wolm- I.

wheel When the speed of the Lear passes he# yond a prescribed limit to bring the threads of the Worm-wheel into engagement with the teeth of the rack, and means co'iperatin'gA with the brake mechanism toyieldingly limlt the motion of the `car .at the time the brake elements are brought into engagement.

2. in a (aanbreke, the combination of a 'fixed braine element, a shaft carried by and movable with the car, a movable braking element revoluble with said Shaft, said movable braking element being adapted to travel along the iixed braking element and When in motion to remain out oi engagement with the same andwhen bron ht to a sto to interlock therewith, gearing lor norma ly operating the shaft, spring-actuated means for throwing said gearing out of operation, a brake adapt'edffto .be operated by said spring-actuated means toarrest the motion .of the shaft and movable member, latch mechanism for holding said spring-actuated mechanism inoporative, and means for automatically retract- IOS element, means for transmitting motion to the revoluble brake element to normall maintain it out of operative engagement Witli the stationary brake element, means for arresting the movement of the revoluble brake element when the speed oi' the car passes beyond the normal to bring said revoluble `bralre element into engagement with the sta-1 `I zo with said brake mechanism to yieldingly limit v tionarv brake element and means associated the motion .oi the car at the time the brake elements are brought into engagement.

ei. in a brake for cars, the combination with a stationary rack-bar, a shaft carried by the car, means lor transmitting motion to' said shai t during the movement of the car, a worm-Wheel having a feathered connection with the shaft to slide to a limited extent v thereon and to rotate therewith, meansfor aeaiia arrestingxmovement of the shaft and wormwheel w en-the speed of the car passes be'- yond a prescribed rate, and cushioningsprings arranged to bear against the ends of t e worm-wheel to limit the sliding movement thereof to 'eldingly limit the motion of the car when t e wheel engages the teeth of the rack. n

5. In a brake for cars, the combination of a stationary rack-bar, a shaft carried by and movable with the car, a worm-wheel carried by the shaft, gearing for operating-the shaft, a brakev device for engaging the shaft, o erating means for arrestinr the action o said gearing and projectinglthe brake device, and means controlled by t e speed of the car and for throwing said operating means into action when the speed exceeds a prescribed limit.

6. In a brake for cars, the combination of a stationary rackbar,-a shaft carried by the c ar, a worm-wheel carried by said shaft .to cooperate with the rack-bar, gearing for operating said shaft, said gearin including a stationary gear member an a movable' gear membe'r adjustable into and out of engagement with said stationary member, a controlling device re ulated in action by the speed of the car, an operating means set into action by said controlling device when the speed of the cai .exceeds a prescribed limit for withdrawing said movable gear inember from engagement with the stationary gear' member to arrest the motion of the shaft and Worm.

7. In'a brake for cars, the combinationof a stationary rack, a shaft carried by the car, a

worm-wheel carried by said shaft to coperate with the rack, gearing for. driving said shaft when the car is in motion,brake mechanism to arrest the Vrevolution of the shaft, operating means for airestinfy the action of the gearing and throwing the brake device into action, means for normally holdingsaid operating dev-icein action, and means controlled by the speed of the car for releasing said actiiating device when the speed exceeds a prescribed limit.

8. In a brake for cars, the combination of a stationary rack-bar a shaft carried by the car, a worm carried by and revoluble with said shaftto cooperate with the rack-bar,

eari' foi'` rotatin said shaft. said earin g ng. .g s g comprising a stationary gear element and a uear-whee movable into' and out of contact -wheel carried-bythe s haftto. coact withit with said gear element, a brake member togengage the shaft, a connection-betweeiijthe' brake element and gear-wheel for-effectingl the simultaneous retraction and projection. thereof, spring means for im artin motion to said connection, a detent or ho Idingthe gear-wheel normally projected and the vbrake retracting said detent whenthe speed ofthe car exceeds a prescribed limit.

9. In a brake mechanism for cars, the combination of a stationary rack-bar, -a rotary shaft carried by the car, a worin-wheel having.

661 evice normally retracted, and a governor for j a feathered connection with said shaft',

sprin s associated with the shaft and wormwhee for cushioning the-downward` movement of the car when the worm-wheel en ages' the rack, gearing for operating the sha t 1ncluding a projectable .and retractable gearwheel, a sliding brake element to'engage the shaft, a sprin -actuated connection etween the ear-whee and brake element to retract the ormer and project the latter,l a spring-'- actuated detent for -normally holding said connection inoperative, and. a governor for 1 retracting said detent when the speed of the car exceeds a prescribed limit.

a stationary rack-bar, a stationary -gear memj i j sa I0.. In abrake forcars, the combination of ber, a rotary shaftcarried by the car, aworm-i rack-bar, gearing for operatiii said shaft said gear-wheel, a sliding brake device toengage the' shaft, [a connection between said shaft and brake device to lthrow the latter intoaction when thel gear-wheel is retracted,

a spring for actuating `said. connection, ai

spring-actuated detent for normally holding said connection retracted, a overnor forretracting said detent when t e speed of the car exceeds a prescribed limit, and'.means 4for manually resetting theparts independent ofthe governor. l

In testimony whereof I aflix my signature in presence of'ltwo'witnesses. f

EDWARD li. WoR'rHINGToN.

Witnesses:4 l

vFiiiin HEEGE, l A .UGUs'r 'Hanan 

